Early diffusion weighted MRI as a negative predictor for disabling stroke after ABCD2 score risk categorization in...

Area of Science:

• Neurology
• Radiology
• Cardiovascular Medicine

Background:

• Transient ischemic attack (TIA) risk stratification is crucial for preventing future strokes.
• The added prognostic value of early diffusion-weighted magnetic resonance imaging (DWMRI) after clinical scoring in TIA patients remains unclear.

Purpose of the Study:

• To evaluate if a negative DWMRI within 24 hours improves the identification of low-risk TIA patients for disabling stroke within 90 days, after ABCD2 score risk categorization.
• To assess the utility of early DWMRI in refining risk prediction for admitted TIA patients.

Main Methods:

• Prospective enrollment of admitted TIA patients across 15 North Carolina hospitals.
• Exclusion of patients not undergoing DWMRI within 24 hours or lacking an ABCD2 score.
• Medical record review to ascertain disabling ischemic stroke outcomes within 90 days.

Main Results:

• Out of 944 TIA patients, 4% experienced a disabling ischemic stroke within 90 days.
• A low ABCD2 score combined with a negative DWMRI showed 100% sensitivity in identifying low-risk patients.
• In moderate/high-risk patients, a negative DWMRI predicted a low risk of disabling stroke (92% sensitivity).

Conclusions:

• Early DWMRI enhances the prediction of low risk for disabling ischemic stroke within 90 days, complementing ABCD2 score stratification.
• Further research in larger, consecutive TIA populations is recommended to confirm DWMRI's role as a sensitive negative predictor.